Mechttu,

Welcome to the Stovebolt. You have two problems listed. No back-up lights and confusion about the neutral safety switch.

These comments are sort of generic because I'm not well schooled in the '93 steering column. The neutral starter safety switch should merely interrupt the power from START (key) to solenoid when the shifter isn't in neutral. This is a simple set of contacts inside the switch that can be verified with a ohmmeter. It should only represent two 'prongs'...a power (START) in and a switched power out to the solenoid.

The additional terminals were probably associated with some other device on the '93 truck, for your switch you would only need 2.

There should be another switch for reverse lights. It would do exactly the same thing switch wise except it would be tied to the back-up lights. It would be OPEN whenever the rig wasn't in reverse.

If you have a small multimeter with a resistance (ohm) function, you can check the operation of these little switches. I thought I remembered a transmission mounted switch on the Turbo-350 but I might be wrong.

Stuart